scholarly journals Comparative study on the fundamental time period of RC buildings based on codal provision and ambient vibration test – a case study of Kathmandu Valley

2017 ◽  
Vol 4 ◽  
pp. 31-37
Author(s):  
Ramila Shrestha ◽  
Sudip Karanjit
Keyword(s):  
Regression Analysis ◽  
Ambient Vibration ◽  
Kathmandu Valley ◽  
Ambient Vibration Test ◽  
Lateral Dimension ◽  
Testing Procedures ◽  
Time Period ◽  
Empirical Relations ◽  
Rc Building ◽  
Base Dimension

For the proper design of any structure, its fundamental properties should be known. The fundamental time period is a primary consideration for seismic design. Generally empirical relations given by code are used in design of building structure, where time period is the function of height and lateral dimension in most cases. But, these empirical relations given by codes are not verified in the context of Nepal. For existing structures, in addition to code formulas and available analytical tools, such as modal analyses, various methods of testing, including ambient and forced vibration testing procedures may be used to determine fundamental time period. In this study, the fundamental period of the 31 RC infill buildings located in Kathmandu valley was identified using ambient motions recorded at each building. Ambient vibration measurements of buildings have been performed by using geophone. Fundamental time periods evaluated experimentally and calculated by different codal formulas were compared. Single variable regression analysis was done, and time period in relation with height is evaluated. In this analysis, codal time period was found higher than experimental one. Multi-variable regression analysis was also done, and the relation between time period, height and lateral dimension was formulated. From multivariable regression formulation, it was concluded that the effect of base dimension of building to fundamental time period is very less. It can be concluded that the fundamental time period of RC building in our current practice can be better correlated by height only relation (T = CHa) than by height and base-dimension relation (T = C H/√D) given by code. Fundamental time period calculated from codal formula for RC building with infill and from experiment was found near in most cases.

scholarly journals Modeling Population Spatial-Temporal Distribution Using Taxis Origin and Destination Data

2021 ◽  
Vol 13 (7) ◽  
pp. 3727
Author(s):  
Fatema Rahimi ◽  
Abolghasem Sadeghi-Niaraki ◽  
Mostafa Ghodousi ◽  
Soo-Mi Choi
Keyword(s):  
Regression Analysis ◽  
Mean Squared Error ◽  
Population Distribution ◽  
Temporal Distribution ◽  
Coefficient Of Determination ◽  
Temporal Modeling ◽  
Location Data ◽  
Time Period ◽  
Proposed Model

During dangerous circumstances, knowledge about population distribution is essential for urban infrastructure architecture, policy-making, and urban planning with the best Spatial-temporal resolution. The spatial-temporal modeling of the population distribution of the case study was investigated in the present study. In this regard, the number of generated trips and absorbed trips using the taxis pick-up and drop-off location data was calculated first, and the census population was then allocated to each neighborhood. Finally, the Spatial-temporal distribution of the population was calculated using the developed model. In order to evaluate the model, a regression analysis between the census population and the predicted population for the time period between 21:00 to 23:00 was used. Based on the calculation of the number of generated and the absorbed trips, it showed a different spatial distribution for different hours in one day. The spatial pattern of the population distribution during the day was different from the population distribution during the night. The coefficient of determination of the regression analysis for the model (R2) was 0.9998, and the mean squared error was 10.78. The regression analysis showed that the model works well for the nighttime population at the neighborhood level, so the proposed model will be suitable for the day time population.

Ambient vibration test results of the Imperial County Services Building

1983 ◽  
Vol 73 (6A) ◽  
pp. 1895-1902
Author(s):  
Gerard C. Pardoen
Keyword(s):  
Strong Motion ◽  
Ambient Vibration ◽  
Vibration Test ◽  
Test Results ◽  
Structural Failure ◽  
Imperial Valley ◽  
Ambient Vibration Test ◽  
Significant Interest ◽  
First Time ◽  
County Services

Abstract The ambient vibration test results conducted on the Imperial County Services Building prior to the 15 October 1979 Imperial Valley earthquake are summarized. These results are of significant interest because the Imperial County Services Building has been the source of many postearthquake investigations due to the fact that the 1979 earthquake represented the first time a building instrumented with strong motion recorders suffered and recorded the major structural failure.

scholarly journals Consumers' Preference of Fast Food Items in Kathmandu Valley

NCC Journal ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 17-25
Author(s):  
Bharat Rai ◽  
Rajshree R Rawal
Keyword(s):  
Regression Analysis ◽  
Fast Food ◽  
Positive Impact ◽  
Pearson Correlation ◽  
Consumer Preference ◽  
Primary Data ◽  
Kathmandu Valley ◽  
Brand Preference ◽  
Independent Variables ◽  
Food Items

The main purpose of this study is to understand and evaluate the factors affecting consumer's preference of fast food items in Kathmandu Valley. Taste, price, ambience and location have been taken as independent variables and brand preference has been taken as dependent variable in the study. The study has been adopted the descriptive and causal research design. Samplesize has been taken 226 under the study. Primary data for the research has-been collected using structured questionnaire from fast food consumer within Kathmandu Valley of University students. To analyze the collected data, descriptive statistics, and Pearson correlation as well as regression analysis has been conducted to identify the relationship and effect between independent variables (taste, price, ambience and location) and dependent variable (consumer preference). SPSS has been used to process the data and to find the result of the data analysis. By the correlation analysis there is significant relationships between independent variables (taste, price, ambience and location) and dependent variable (brand preference). Based on regression analysis, taste, ambience and location have significant and positive impact on consumer preference for fast food items. It means consumers are much more concerned and aware about these factors while consuming the fast food. Similarly, price has less or no effect on consumer preference for fast food items for the respondents taken under the study.

Torsional Behavior of Irregular RC Building under Static and Dynamic Loading

2019 ◽  
Vol 969 ◽  
pp. 247-252
Author(s):  
S. Neelavathi ◽  
K.G. Shwetha ◽  
C.L. Mahesh Kumar
Keyword(s):  
Present Situation ◽  
Shear Wall ◽  
Reinforced Concrete Structure ◽  
High Rise ◽  
Time Period ◽  
Rc Building ◽  
Earthquake Load ◽  
Structural Irregularities ◽  
Static And Dynamic Loading ◽  
Storey Building

In the present situation the growth of population is increasing rapidly. In view of this, the development of the buildings are changing its dimension to high rise structures further having trends of structural irregularities. These kinds of irregularities in the structure cannot be avoided as it is more vulnerable to the seismic actions. The structure fails by the uneven moments created by the seismic actions because of the irregularities in the structure which is based on the parameters like storey drift, displacement, torsional effects etc., In this paper the effects of the torsional irregularity is studied and the failure has been minimized by adding necessary elements like shear wall and bracings where ever required. In Present study we have considered the 20 storey building of reinforced concrete structure which includes five models of different regular and irregular shaped structures which are subjected to earthquake load and are modeled by using ETABS version 9. Analysis results elaborate the parameters like displacement, time period, storey drift and comparisons of the results among the set of models.

scholarly journals Ambient Vibration Test on Reinforced Concrete Bridges

2016 ◽  
Vol 47 ◽  
pp. 02012 ◽  
Author(s):  
Nurul Shazwin Idris ◽  
Koh Heng Boon ◽  
Ahmad Fahmy Kamarudin ◽  
Sherliza Zaini Sooria
Keyword(s):  
Reinforced Concrete ◽  
Concrete Bridges ◽  
Ambient Vibration ◽  
Vibration Test ◽  
Ambient Vibration Test ◽  
Reinforced Concrete Bridges

scholarly journals A Review of Ambient Vibration Technique on Bridges

2015 ◽  
Vol 773-774 ◽  
pp. 1002-1006
Author(s):  
Nurul Shazwin Idris ◽  
H.B. Koh ◽  
Ahmad Fahmy Kamarudin
Keyword(s):  
Dynamic Characteristics ◽  
Ambient Vibration ◽  
Vibration Test ◽  
Dynamic Information ◽  
Ambient Vibration Test ◽  
Vibration Technique ◽  
Highly Sensitive ◽  
Sensitive Sensor ◽  
Non Destructive ◽  
Labour Time

Bridge is one of the important facilities use in daily life as bridge is built to span physical obstacles such as a body of water, valley or road for the purpose of providing passage over the obstacle. Various testing conducted on the bridge in order to know the dynamic characteristics of the bridges. One of popular testing use is ambient vibration test. Ambient vibration is a non-destructive test conducted using highly sensitive sensor. This testing is easy to be conduct with less labour, time and also cost. This paper aim to provide up to date literature review on ambient vibration test on bridge includes sources of ambient vibration, procedure of conducting the measurement and results from ambient vibration test. It is important to known the dynamic characteristics of the bridge especially to determine the dynamic response of the structure and also as dynamic information for seismic design.

Sign in / Sign up

Export Citation Format

Share Document